A method for improving ranging accuracy based on waveform superposition

By employing signal processing methods such as synchronous transmission and data acquisition, multi-mode superposition processing, dual-threshold positioning, time interpolation, and error calibration, the problems of target misjudgment and accuracy degradation in pulsed laser ranging under complex atmospheric environments have been solved, achieving high-precision ranging. This method is applicable to existing 905nm wavelength pulsed laser ranging systems.

CN122362402APending Publication Date: 2026-07-10JIANGSU BRIGHT SPOT PHOTOELECTRIC RES CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU BRIGHT SPOT PHOTOELECTRIC RES CO LTD
Filing Date
2026-04-20
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In complex atmospheric environments containing aerosol particles such as fog, haze, and dust, pulsed laser ranging technology is susceptible to scattering interference, leading to target misjudgment and echo signal attenuation and distortion, resulting in decreased ranging accuracy. Existing technical solutions suffer from high power consumption, high cost, or poor compatibility.

Method used

By employing synchronous transmission and data acquisition, signal processing methods including mode overlay processing, dual-threshold positioning, time interpolation, and error calibration, combined with cyclic buffering and digital domain signal processing, the ranging accuracy of the laser ranging system is optimized. This method is suitable for pulsed laser ranging systems with a wavelength of 905nm.

Benefits of technology

High-precision ranging was achieved in complex atmospheric environments, reducing power consumption and cost, avoiding hardware modifications, ensuring the stability and accuracy of the ranging system, and making it suitable for existing equipment.

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Abstract

This invention relates to the field of laser ranging technology, and in particular to a method for improving ranging accuracy based on waveform superposition. The steps are as follows: A precise time reference is constructed through synchronous transmission and data acquisition; the number of waveform superpositions is adjusted according to the ranging distance, with fewer superpositions for close distances to ensure real-time performance, and multiple superpositions for long distances to strengthen weak signals and suppress aerosol interference, outputting a high-quality synthetic waveform; dual-threshold target positioning is performed based on the synthetic waveform to accurately identify key sampling points at the leading and trailing edges of the echo; linear time interpolation is performed based on the key sampling points; the distance is calculated using the precise time obtained from the interpolation, and a correction coefficient is used to offset waveform broadening errors, followed by multi-calibration point fitting coefficients to compensate for hardware deviations. Thus, by using waveform superposition and threshold positioning, target misjudgment caused by aerosol scattering is eliminated, and by using interpolation subdivision and coefficient compensation to solve the accuracy reduction caused by echo distortion, the core challenge of ranging in aerosol environments is ultimately overcome.
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